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feat: Add container positioning to Toast and Snackbar components (#2203)

* feat: Add container positioning to Toast and Snackbar components

- Both toast and snackbar are now popovers, ensuring top-layer
rendering and no need for z-index management.

* refactor: Alert mixin improvements and documentation

* refactor(toast): use CSS anchor positioning for toast placement

Replace position: fixed with position: absolute and position-area: center.
Use align-self (start | anchor-center | end) per position variant instead
of per-rule inset-block and transform overrides.

Remove the _containerPosition getter and inline style assignments from
the alert mixin — positioning is now handled entirely in CSS.

* refactor(snackbar): use CSS anchor positioning for snackbar placement

* fix(toast, snackbar): reset conflicting popover UA styles

* refactor: Fixed unit tests for new structure and some mixin refactoring

Closes #2154

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Co-authored-by: Simeon Simeonoff <sim.simeonoff@gmail.com>

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